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Contract Assets and Contract Liabilities - Summary of Accounts Receivable and Unbilled, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Revenue From Contract With Customer [Abstract]    
Accounts receivable $ 100,146 $ 127,877
Unbilled receivables 27,457 28,368
Less: allowance for doubtful accounts (317) (583)
Total accounts receivable and unbilled, net $ 127,286 $ 155,662